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Abstract

The ultraviolet (UV) range presents new challenges for plasmonics, with interesting applications ranging from engineering to biology. In previous research, gallium, aluminum, and magnesium were found to be very promising UV plasmonic metals. However, a native oxide shell surrounds nanostructures of these metals that affects their plasmonic response. Here, through a nanoparticle-oxide core-shell model, we present a detailed electromagnetic analysis of how oxidation alters the UV-plasmonic response of spherical or hemisphere-on-substrate nanostructures made of those metals by analyzing the spectral evolution of two parameters: the absorption efficiency (far-field analysis) and the enhancement of the local intensity averaged over the nanoparticle surface (near-field analysis).

Fig. 4 Local electric field distribution for an isolated core-shell spherical and hemispherical nanoparticle for each metal, with R = 40 nm, Rcore = 30 nm, and a 10 nm thick oxide shell. The illuminating wavelength in each case corresponds to the one that makes Qabs maximum.

Fig. 5 Evolution of 〈|E⃗core |2〉/〈|E⃗shell|2〉 for each metal as a function of the metallic core size for a spherical and hemispherical nanoparticle of radius 40 nm at the wavelength at which 〈|E⃗shell|2〉 takes its maximum in the electric dipolar resonance.

Fig. 6 Evolution of the peak value (top) and location (bottom) for the Qabs (circles) and the 〈|E⃗|2〉 (squares) for spherical (red) and hemispherical (blue) nanoparticles of Mg/MgO, Al/Al2O3 and Ga/Ga2O3.